Magazine type magnetic recording and reproducing device



Oct. 23, 1951 M. CAMRAS 2,572,596

MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE Filed Dec. 29, 1944 9 Sheets-Sheet 1 Z2 ZVEZ 22:1

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9 Shets-Sheet 2 f/newzv Cmmenc M. CAMRAS MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE i|ll||| all a Oct. 23, 1951 Filed Dec.

Oct. 23, 1951 M. CAMRAS 2,572,596

MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE Filed Deb. 29, 1944 9 Sheets-Sheet 5 ZnYEmZQF Oct. 23, 1951 M. CAMRAS 2,572,596

MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE Filed Dec. 29, 1944 9 Sheets-Sheet 4 1d WM.

W Ema Em Er Mme w/v (ZINE/4 s Oct. 23, 195] M. CAMRAS 2,572,596

MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE Filed Dec. 29, 1944 9 Sheets-Sheet 6 Mmew/v ("n/1.424s.

Oct. 23, 1951 M. CAMRAS 2,572,596

MAGAZINE TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE Filed Dec. 29, 1944 9 Sheets-Sheet 8 VOLUME INDICATOR REPEAT FORWARD REWIN D S KN FORWARD 510? Patented Oct. 23, 195i U NI STATES PAT OF [E E.

2,572,596 INE T PE MA E IG REQQ AND REPRODUCING DEVICE Marvin Ca'mras, Chicago, IllL-;-assig'nor to Armour Research Foundation i of Illinois: Instituteof Technology, a corporation of; Illinois A plicaticn'becembe'r 29, 1944,1Serial'No'. 5701291" This invention relatesto' improvements in a"- magazine type magnetic recording and reproducing; device; and more-particularly-to'a magnetic recording and reproducing device-usable with'recaudible or inaudible impulses maybe made bv magnetizing an elongatedrecording medium such as a wire or tape'and'reproductionsmay-bemade from the' magnetized-medium; it-hasbeen found desirable to extend the universality of use of such devices. In the past; such' devices, either as'a recording device'only," a reproducing'devic'e only; or a combination recordingand reproducingde vice, have been" somewhat" limited in their'universal-aspect; and one" of the reasons for' such" limitation has been the care necessary in handling'the'recording medium; mounting-it upcn'a machine, removing it therefrom, and'the care necessary to transport that medium from"on-e' machine to'an'other; even though'the transportation' be byhandthrough' a relatively short distanceI Another'reason' was in thevar'iance of the length of medium, and the size andcharacter' of reels'upon which that medium is carried' Itis now desirable to produce a magneticfrecording and reproducing instrumentality capable of use with record magazines, each magazine containing reels or equivalent carrying structure, and the recording, medium, all-housed within an easily transportable, easily usable, and reasonably damage-proof casing. Such casings may be allvof. substantially the same size or character,

and accordingly, a single magnetic recording'and' reproducing instrumentv may be used to make records-for reproduction elsewhere, or be used as a reproducer of records purchased orotherwise' acquired elsewhere sothat magnetic'recordingsa may be purchased and'usedior homezentertainment in the manner of the commonly known phonograplrz-recordg Likewise," such: instruments may be utilizedrimoflices in the manner of the commonly known office dictating and'reproduc ing equipment now utilizin'g wax"'records. use-.ofrsuch a machine is thensubstantiallyuniversaL With the foregoing-in mind; it is an-irnportant obj ectof the -"instant invention -toprovide 'a mag 18 Claims'.= 01. 179-1002) 1 neticrecording and reproducing device capable offunctioningv'vith-re'cordmagazines; or, so-to speak, capable=of being loaded for either record ing or reproducing purposes with arecord-maga=- zine.-

Another object' ofthe instant invention is the provision of a magnetic' recording and reproduc ing device whereina plurality'of record contain ing magazines maybe in operation" at the same" time, each-being actuated" for theperform-ance of a different function:

Also ant obj ect" of the instant invention is" the" provision ofa magnetic recordingand' reproduc ing device wherein" a'" recording or reproduction" may be madesimultaneously" with" the rewinding.

of another record'm'eaiummr recording or. re.- produci'n'g' urposes;

It is' also a feature of the instant invention to provide as magnetic recording and reproducing device; usable with'rcordmagazines,and so constructedtofunction as arecord player, as a rec,-- 0rd maker, or inthe manner oian ofiice dictating machine or ofice reproducingmachine,--and wherein one recording maybe rewound forlater reproduction while. another recording carriedby a separate magazine may be made or reproduced;

It is; also-a feature :of the instant inventionito provide as magnetic recording; and reproducing device foruse withrecord:magazines;,each- 0011",; taining the reels; or other carryingrmea'ns and a:

erasing; head-, ane wherem the machine itself contains all of the drive mechanism' foroperating the movable-parts Witliin'tki'em'aga-zine;

azine ie -=pressed into proper position in asso ciation with-"the device.

It is alsoan obj'ect oftheinvention' to' pro vide a magnetic recording andreproducingd vice of-=a characterset forth'h'erei'n' embodying,

means to partially eject a magazinefwhei'i' it"is" desired" to remove" thesam'efrom the devices),

as to render that reinrjavalf operation extremely" easy with as little attention as possible required on the part of the operator.

A further feature of the invention resides in the provision of a magnetic recording and reproducing device for use with record magazines, having means associated therewith to function as a safety feature and prevent operation of the device to either record or reproduce if the magazine is not properly positioned in its association with the device itself.

Still another feature of the instant invention resides in the provision of a magnetic recording and reproducing device for use with record magazines, embodying means to stop the prime mover or driving mechanism if the magazine release is actuated, regardless of the setting of the control switches governing the operation of the device.

Still a further object of the instant invention resides in the provision of a magnetic recording and reproducing device for use in connection with record magazines, embodying a repeat arrangement whereby the operator can listen back to a short portion of a record being made at any time desired by the operator.

It is also a feature of the invention to provide such a device for use with record magazines, so constructed that corrections or changes may be made in a record during the making of the record, at the will of the operator.

Another feature of the instant invention is the provision of a magnetic recording and reproducing device of the character set forth herein, having complete push-button operation and control, except for the volume adjustment.

Also a feature of the instant invention is the provision of a magnetic recording and reproducing device usable with recording magazines, with the controlling circuits arranged in substantially fool-proof manner to automatically cut out the effect of one control unit, if another is actuated, to thereby eliminate any possibility of injury to the mechanism, in the event an operator starts an operation, while another operation is in effect.

It is also a feature of the instant invention to provide a magnetic recording and reproducing device embodying a direct friction roller drive system.

Also a feature of the invention is the provision of a magnetic recording and reproducing device embodying a direct, automatic, and quick acting braking system for the movable parts.

Still another feature of the invention resides in the provision of a magnetic recording and reproducing device incorporating relay control of the driving mechanism.

Further, it is an object of the instant invention to provide a magnetic recording and reproducing device usable with record magazines, which device is compact in size, light in weight, economical to operate, and provides a ver pleasing appearance.

While some of the more salient features, characteristics and advantages of the instant invention have been above pointed out, others will become apparent from the following disclosures, taken in conjunction with the accompanying drawings, in which Figure 1 is a perspective view of a magnetic recording and reproducing device equipped with magazines, and embodying the principles of the instant invention;

Figure 2 is an enlarged bottom plan view of one of the magazines itself;

Figure 3 is a longitudinal vertical sectional view, with parts in elevation, taken through a magazine itself, substantially as indicated by the staggered section line III-III of Figure 2, looking in the direction of the arrows;

Figure 4 is a top plan view of the magazine itself, with the cover removed, looking into the interior of the magazine;

Figure 5 is an enlarged vertical sectional View, with parts in elevation, of a portion of the magazine taken substantially as indicated by the staggered section line VV of Figure 4;

Figure 6 is a view similar to Figure 5 and taken in the same location, but showing the parts of the magazine in association with the magazine tray of the device, and the movable parts in a different position;

Figure 7 is a longitudinal vertical sectional view, enlarged, of the structure of Figure 1, illustrating the magazines and other parts in elevation for purposes of clarity;

Figure 8 is an enlarged fragmentary elevational view of one of the driving units embodied in the device of Figure 1, with parts broken away and parts in section, and showing one of the magazines in operative association with the unit;

Figure 9 is a plan sectional View of the driving unit of Figure 8, taken substantially as indicated by the staggered section line IXIX of Figure 8;

Figure 10 is a bottom plan sectional view of the driving unit taken substantially as indicated by the line X-X of Figure 8;

Figure 11 is a fragmentary top plan view of the device of Figures 1 and '7, with the magazines removed;

Figure 12 is a fragmentary vertical sectional view similar in character to Figure '7, but with the driving unit removed to illustrate the magazine holding and release mechanism;

Figure 13 is a view of the same character' Figure 16 is a top plan view of a remote control arrangement of somewhat different construction;

Figure 1'7 is a topplan View of another remote control arrangement embodying but a single push button, a simplified form of remote control;

Figure 18 is a fragmentary face view of the exposed control panel portion of the device, showing a different control arrangement from that seen in Figure 1;

Figure 19 is an enlarged fragmentary vertical sectional view through the structure of Figure 18 taken substantially as indicated by the line XIX-XIX of Figure 18;

Figure 20 is a duplicate view of a portion of the structure of Figure 19, showing the parts in a difierent stage of operation; and

' The magazine also includes automatically functioning brake mechanism for the reels. In view of the fact that an identical brake mechanism is associated with each reel, only one need be described herein. With reference more particularly to Figures 5 and 6,- it will be seen that adjacent each reel an upright post is provided in the casing of the magazine. Such post 36 extends through the bottom of the magazine and is provided with a hollow cavity 31 therein. Within that cavity is a coil spring 38 operating against a plunger 39. Normally the spring tends to force the plunger 39 out of the cavity, but such movement of the plunger is limited by a cross pin 40 carried by the plunger and having its opposite ends riding in a vertical slot 4| in the post. A braking member 42 which is of substantially a U-shape, as seen in Figure 4, is pivoted at its upper end to the post by a pivot pin 43. This braking element has a diagonal slot 44 therein also engaged by the plunger pin 40. When the parts are in normal position, that is with the magazine removed from its aforesaid tray 1, the brake member 42 will bear against one of the flanges of the adjacent reel, as seen in Figure 5, by virtue of the action.

of the spring 38. However, when the magazine is placed into position in the tray 1, the aforesaid stud 8 extending upwardly from the bottom of that tray forces up the plunger against the action of the spring 38 and by virtue of the pin 40 riding in the oblique groove 44 of the brake member, the brake member is retracted to the position seen in Figure 6, thus permitting free rotation of the respective reel.

Immediately upon lifting the magazine out of the tray 1 the spring 38 forces the plunger downwardly and sets the brake against the reel. The advantage of this arrangement is that the reels are held against rotation when the magazine is not in use so that the recording on the wire may be kept in exactly the same place, if so desired, and there is no danger of scrambling the wire by unintentional or accidental rotation of the reels within the magazine.

A suitable plug-in socket 45 is mounted in the bottom of the magazine for automatic engagement with a complemental plug 46 in the bottom of the magazine tray 1, as seen in Figure 11. Thus, when the magazine is pressed into position in the tray all circuit connections for the head 3 I, and for passing current through the wire itself by means not illustrated, are at once established. Accordingly, insofar as the magazine is concerned, nothing need be done by the operator except to place the magazine in position in the receiving tray 1 and all necessary circuit connections, brake release, and driving connections are automatically made.

With reference to Figure 1 it will be seen that each of the magazines may be provided with a plurality of windows 41 through which the operator might observe the rotation of the respective reels, and through one of the windows a scale denoting time increments of a recording, increments of length of the wire collecting upon one of the reels, or some equivalent means of measuring the amount of wire utilized in a particular recording, may be visible. Such a scale and the mean for actuating the indicating finger thereof have not been illustrated in the drawings but may be incorporated in the magazine in any suitable manner.

The control panel The control panel 3, seen in Figure 1, has mounted thereon all of the control and indicating means necessary for the actuation of the entire device. The control means include a forward push-button 48, a stop push-button 49, and a rewind push-button 50, each push-button being accompanied by a jewel lamp 5| to indicate which is in operation. There is also a dial 52 movable between recording and listen position, that particular dial 52 being set upon the listen position when a reproduction is being made. Further, there is a volume control 53 with a suitable volume indicator 54 thereadjacent, by means of which the operator can adjust the volume both for recording and for reproduction.

As much as possible, the controls are in the nature of push-buttons in the preferable construction. It will be apparent that two pushbuttons might be substituted for the switch 52, if so desired, in a well-known manner. Also, as will more fully appear later herein, the respective push-buttons are so arranged and so connected in the wiring circuit, that if one of the buttons is pressed while operation is proceeding as a result of the actuation of another button, the proceeding operation will be immediately stopped and the new operation begun, automatically and Without injury to either the mechanical parts or the electrical circuit.

The drive units The drive units are best seen in Figures 7 to 14, inclusive. These units are preferably suspended from the bottoms of the magazine receiving trays 'I-l. The drive unit l3 associated with the magazine used for recording and reproducing purposes is somewhat more complicated than the drive unit I4 associated with the rewind magazine, in that the unit 13 must include both a forward drive and a reverse drive preferably of different speeds, together with an automatic braking system, while the rewind unit [4 need only have what corresponds to the reverse drive in the first unit. Both units are similarly located, similarly mounted, and similarly operated. Accordingly, it is only necessary herein to specifically describe the unit i3.

As seen best in Figures 7 and 8, the driving unit I3 is suspended from the bottom of the tray 1 by means of a plurality of posts 55, there being four in the illustrated instance. These supporting posts 55 carry a pair of spaced horizontally disposed platform frames 56 and 5'1, and it will be understood that the frame members 56 and 51 carry suitable bearing means to accommodatev the journals of the various shafts. Elevated from the frame platform or plate 56 by a series of posts 58 is another frame plate 59 of lesser size to provide additional bearing means where needed. Suspended from the lower frame plate 5'! by means of a plurality of insulating supporting posts 6|], three in the illustrated instance, is a motor supporting plate 61.

Suspended from the plate 61 is a prime mover which in the illustrated instance is in the form of an electric motor 62. The armature shaft of' this motor extends upwardly through a suitable aperture in the frame plate 51 so that this shaft 63 is in position for engagement by a frictiondrive roller 64. This drive roller 64 is an idler, and its shaft 65 is freely journalled in a U-shaped bracket 66 pivoted as at 61 between the confronting jaws of another U-shaped bracket 68 fixed in position between the frame plates 56 and 5'! by a keyed post 69, as best seen in Figure 10. A spring 16 constantly urges the drive wheel 64 into frictional engagement with the motor shaft :friction clutch .Tsl floating on :a shaft 12..

)9 63 and with azcircumferential surface :ofza hollow with reference to. Figure 8 it"will beseenthat'thesface .of the clutch H is pressed into frictional engagement with-adrive-wheel J13 bymeansaofaazspring "14 surrounding the hub :of the-ciutchaand zbearing against a collar '75 held in proper position :relatively to the shaft 12 by a spring ring Hi. The drive plate [3 is, of course, keyed tov the shaft '12. It will be appreciated that the clutch TI is in the nature of a slip .clutchzso .thaztif for any reason the motor should be operating :at toohigh a speed at .any interval of time, --no injur will result to the wire recording medium 22, because slippage will occur between .the clutch 3H and the drive plate F13. The same protection to the medium results 'upon application of "the brake means. I

Telescoped over the upper end :of the shaft 12 is a castellated head 'i'i secured to "the shaft by means of a transverse pin 18 extending through an elongated :slot .19 :in the shaft. A spring 89 disposed between a pair of collars :81,

disposed around the shaft, and .8 2 fixed to the head TH constantly urges this head outwardly C01 upwardly so that .the .head constantly :extends through a suitable :aperture 83 :(Fig. '11') in the bottom of the magazine receiving tray 1. The castellated ahead J is thereupon in position to be automatically engaged by the aforesaid ;pin .26 en-theshaft it of the reel 12.1 when the mega-- zine is placedin ;position,.such-engagement being Seen in the upper right-hand portion of Figure-8. By virtue .of thecastellations the head 11., .the drivingengagementof the .pin 2.6 withthathead will be automatic, andifitshouldso happen-that the pin did .not .enter Lopposed grooves in the head at the time the magazine is placed inposi- ,tion, it will .so enter the grooves immediately upon the starting of the motor.

For effecting a ,drive of the aforesaid level wind shaft '21, a shaft 81 is suitably journalled in the frame plates 56 and 59. This shaft extends upwardly and is provided with a castellated head '85 urged upwardly by a spring 85 in the .same manner as above described in connection with the castel-lated head 7-1 on the shaft 12. The castellated head 85 'is engaged "by the pin 31] of the shaft 21 when the magazine is "seated into position in the tray 1.

The shaft -84 and consequently the level wind shaft 27 are 'driven by the shaft I2 through a gear train comprising an integral gear portion 8! forrneden the shaft 12, a gear 88, having a shaft suitably -journalled in the plates 56 and 59, and a gear 89 keyed to the shaft '84. It will be noted that this gear train is a reduction gearing arrangement so that the level wind shaft 2 is driven .at :a considerably lower speed than the shaft '12 and the :shaft H! of reel"2 The driving arrangement so far described effects :a positive .drive of :the reel 21 and :also of :the level awinding arrangement. This, :as explained above, is a .drive in the forward direction, in which event the :reel is the receivin real for the ;r.ec or.dir1g medium :22 and during such operation either :a recording or a reproduction is in p ocess. When it is desired to reverse the direction ;of the recording medium for rewinding purposes, the reel 2.! becomes the supplyreel and is permitted to idle, while a positive :drive -;of the :reel 12;!) zestablished. When the reel 2 01s positivelyrdrivenzthe level wind arrange- .ment is .idri en :solely by rthe pull :on the wire recording gnediurn .122. diti-that'time, while'the '10 sreelsshaft i9 and the drive shaft 12 will both :be coasting they nevertheless will be turned by the :pull of thewire'because they are still connected,

"thus the level wind will also be driven by virtue ;of .thegearing 81, 88 and 89, as above explained. The recording medium has more than ample tensile strength 'to accomplish this drive 'of the "level wind arrangement.

The direct drive arrangement for the reel 20 includes ashaft 90, having a :castellated head .91 vtelescoped over the end of the shaft and urged outwardly by a spring 92 in the manner above described for the .other shaft. This shaft also carries a friction "wheel 93 engaged at all'times by an idler friction wheel 94 journalledin a fixed frame member 95, .as seen clearly in Figures 8 and "14. This idler wheel "94 may be 'frictionally engaged by a friction drive wheel 396 journalled in a frame '91 pivoted on a pin '99 anchored in the confronting arm of another 'U-shape frame member pivoted between the plates '56 and 511 on .a pin ['00, as clearly seen in Figures lllandl. Aspring 10! urges the idler wheel 94 into contactwith'the'friction wheel 93, and a spring ['02 urges the "friction drive wheel 96 into contact with both the idler wheel 94 and the motor shaft 63.

From the description thus far, and with reference to Figure 1'0,"it will be noted that when the power is off thefriction drive wheel *6'4 is in operative position tending to move 'the recording medium "22in "the forward direction, at the same :time the friction drive wheel '96 is "in operative position tending to move the recording medium :in the reverse direction. Consequently, the medium is held-at "a standstill "by this novel automatic braking method. If "the drive whee1'96 is retracted against the action of spring 102 by means to be later described, and the apparatus is operating inthe forward direction, "immediately upon stopping the forward movement, the drive 'wheel "'96 is released :and pulled into operative position by the spring m2 so that an immediate and effective bra-king action results. Conversely, ifthewheelB'B "is in operationmoving therecording medium in the rewind direction, and the wvheel Blis retracted, this wheel 64 is pulled into operative position by the spring H! immediately upon stopping of the rewind movement. Therefore, there will clearly be no overrunning or coasting of either of the reels upon stopping an oper ation, because the friction drive element will promptly brake the moving parts positively and yet sufficiently gently to eliminate any likelihood of injury to the recording medium.

Control of the friction drive wheels is accomplished by means of relays, in the illustrated instance. These relays and their operation are best "illustrated-in Figures =8 and 14. When the forwardbutton-IB -'(Fig. l) is pressed the motor 62 is energized and the recording medium is moved intheforwarddirection bymeans of the friction drivewheel "64 and the slip clutch H causing a positive drive-of the shaft IQ of the reel 2|. Not only is that accomplished, but the pressing of thatfor-ward' buttonlfl also energizes a relay I03 (-Fig. 149 causing a movement of the armature 4:04 of that relay towards the core. The armature thereupon moves a pivoted lever 105 about its pivot point 1136 against the action of an armature retracting spring 101. The free end of the lever l-"05 abuts the aforesaid pivot pin 98 and movesit such 'amanner as to withdraw the 'friction dr-ivewheel 96 from its contact with the motor-shaft and with the idler'friction wheel 'a fretracting spring I I 2.

94. ."When the relay I03 is actuated, and the armature moves, the armature releases'the plungerIBB of a gang switch I09 controlling other sub-circuits of the apparatus, which gang switch will'be more fully explained in connection with the wiring diagram of Figure 21. When the stop button 49 is pressed, the motor 62 is not only deenergized, but the relay IE3 is also .deenergized, and the automatic braking means'above described come into effect by virtue of the release of the friction drive wheel 96. Likewise, the plunger of the gang switch I09 is permitted to move in the opposite direction and reverse the energization of the sub-circuits controlled by that switch.

. When the rewind button 50 is pressed the 'motor 62 is again energized, and the recording medium 22 is moved in the reverse direction by the drive from: the motor shaft through the friction wheel 95, the idler friction wheel 94, and the friction drive wheel 93 on the shaft 90, creating a positive drive of the shaft I8 of the reel 20. The reel 2| is'now the idler and supply reel.

'At the same time, a relay II I] is energized to" draw in'its pivoted armature III against the action of The free end of this armature bears against a pivoted lever H3 and moves that lever about its pivot point I I4 so that the opposite end of the leverwhich is normally in abutment with the frame bracket 65 carrying the frictiondrive wheel 64 will move that frame bracket so that the drive wheel is carried away from-its contact with the motor shaft I33 and the slip clutch "II. The movement of the armature I II also relea es the plunger I I5 of a gang switch vI I5, causing that gang switch to exercise a control over certain sub-circuits to be later described.

When the stop button 49 is a ain pressed, the motor 52 and relay III) are both deenergized, permitting the friction drive wheel 64 to again fall into contact position with the motor shaft 63 and the slip clutch II, bringing into effect the above described braking system. At thesame time, the plunger II5 of the gang switch is released so that the energization of those sub-circuits is also reversed.

As will more fully later appear, the circuits are substantially fool-proof so that in the event the forward button has been pressed for forward operation. and in lieu of the stop button'being pressed. the rewind button is pressed, there will be no damage done. stopping, the braking arrangement will come into effect temporarily, and operation will resume in the opposite direction without injury to any of the parts and without any sudden jerk or undue tension upon the recording medium--22.

With reference to Figure '7, it will be seen that a similar drive unit is employed for actuating the reels of the rearward magazine to cause a rewindinq of the recording medium in that mag- .azine. This second drive unit I4, while similar to the unit I3, need not employ all of the mechanism of the unit I3, such as the relays and the forward drive arrangement. The drive unit-I4 includes a motor II'I having an upstanding armature shaft II8 in position to be engaged by a friction drive wheel I I9 which also rides against .a friction wheel I20 carried on a shaft I2I having a castellated head I22 for connection with a magazine reel in the manner above described. No forward drive is necessary because this magazine is positioned for rewinding purposes. A suitable level winding arrangement as above described, or means for actuating the 16V6l Wi d There will be a temporary 12 arrangement in the magazine in the manner above described may also be employed, if such is necessary. The drive unit I4 may be separately controlled from the drive unit I3 by means of start and stop buttons positioned in any feasible or judicious location, as will be more apparent from the later description of the wirin diagram of Figure 21.

The magazine latching and release mechanism Means are provided to positively latch a ma azine in operative position when it is pressed into the receiver or tray I. Included with those means are also means to effect a quick and positive release of the magazine when it is desired to remove it. Coupled with those release means is a switch mechanism designed to open the motor circuit whenever the magazine is released. All of these means are best illustrated in Figures 11, 12 and 13, with an initial part location reference to Figure 7. I

With reference to Figures 12 and 13, it will be seen that each magazine, in the lower part I5 thereof, is provided with a plurality of apertures I23, there being four such openings in the illustrated instance. Opposite each of the openings I23 the tray! is also apertured inits side wall as indicated at I24. When the magazine is seated in proper position in the tray I (Fig. 12) a latch I25 extends through the openings I 24 and I23 and firmly holds the magazine in position. In the illustrated embodiment, there are two such latches I25 fixed to a shaft I26 extending along each side of the magazine, those shafts being suitably journalled adjacent the side wall of the casing I. Each shaft is normally held in that degree of rotation to maintain the elements I25 in latching position by means of a spring I21 engagin the end of a lever I28, the other end of which lever I28 is keyed to the shaft I26. Opposite the leverv I 28 is another lever I29, the inner end of which has a pin and slot engagement with the lever I28 as indicated at I30, and the outer end of which is keyed to the opposite shaft I25. These levers I28 and I29, as best seen in Figure 11, are disposed near one side wall of the casing I in order to conserve space within the casing.

The shafts I 26-I26 also carry-magazine release means in the form of a number of arms I3I each of which has one end keyed to the respective shaft I26, and carries a pusher I32 on the free end. Each pusher is adapted to project through a registering aperture I33 in the bottom of the tray 1 upon release of the magazine.

In order to actuate the release mechanism, a push key I34 is disposed adjacent the magazine and preferably in a central position as seen clearly in Figure 11. This push key is mounted on the top of a plunger I35, the lower portion of which carries a transversely extending pin I36 engaged in an elongated slot I3'I of a crank arm I38, the inner end of which is'keyed to the adjacent shaft I 26.

Switch means are also controlled by the push key I 34. A switch I39 may be feasibly mounted upon the partition 9 of the cabinet construction, and this switch has a projecting push button I40. The switch is preferably of the char acter commonly known in the trade as a micro switch which effects an opening of a circuit when the push button is pressed inwardly. An actuating arm I4I extends downwardly from the plunger I35 and is provided with a head I 42 for actuating the push button I40 when'the plunger is pressed downwardly.

From the above description, it will be seen that when a magazine, is placed in the tray 1, it isv a simple expedient to push the magazine to the bottom of the tray by a gentle pressure until the latches I25 engage through the openings I23 in the magazine. As'explained above, the reel shaft and the level wind shaft within the magazine are then also automatically engaged with the corresponding shaft of the drive unit. The structure is seen in operative position in Figure 12. When it is desired to remove the ma azine, it is a very simple expedient to press the push key I34 and thus rotate the adjacent shaft I26, as well as the remote shaft I 26' by virtue of the pin and slot connection I30 between the levers I28 and I29. Rotation of these shafts. by the pushing of the lever results in withdrawing the latches I 25, and forcing the arms I3I upwardly so that the pushers' I32 extend through the hoes I33 in the bottom of the tray and partially elevate the magazine out of the tray, as seen in Figure 13. At the same time, it will be noted that the actuating arm I4I descends with the plunger I35 and opens the motor circuit by pressing in the push button I40 of the switch I39, thereby stopping the operation of the motor and the entire drive unit, and avoidin any possible in urv to the mechanism inside the ma azine, or to the operators hand. It is a simple expedient for the operator to lift up the partially reeased magazine from the position seen in Figure 13.

As is evident from the showing in Figures 7, 11 and 12, similar holding and release mec anism is provided for the rear magazine acted upon by the drive unit I4. Obviously, a similar mic oswitch mechanism may be incorporated withthe release means for the rear magazine if so desired, or, in some instances the switch I 39 for the forward magazine may control the ci cuit through both motors 62 and I I1, depending upon what appears to be the most feasible construction for a particular installation.

Remote control arrangements Many times, especially in connection with oiiice work where the recording and reproducing device is used for office dictating and transcribing purposes, it may be desired to control the device from a relatively remote point. For example, the device may be placed in any judicious location in the vicinity of the dictator but entirely out of the way of the dictator, especially oif his desk. He

may then control the device by operating a remote control station upon his desk or afiixed to the side of his desk so as to have added freedom of movement.

To this end, the instant invention may be controlled effectively by a remote control station such as that illustrated in Figure 15. This station includes a box I43 which takes up a relatively small space, and the box embodies a push button I44 for stopping the apparatus, a forward button I45, a rewind button I46, and a jewel type indicating lamp I47 for each of the buttons. The box may be connected through a suitable multi-wire cable I43 to a plug I49 which may be inserted in a suitable receptacle in the cabinet of the device.

A simpler remote control station is illustrated in Figure 16. This station includes a box I 50 having push button switches therein including a stop button II, a forward button I52, and a rewind button I53. This station does not embody thejewel type indicating lamp. The box I50 may be connected through a suitable multi-wire cable I 54 to a plug I55 for insertion in aqcomplemental receptacle in the cabinet of th recording and reproducing device itself.

Perhaps the. simplest form of remote control station isv illustrated in. Figure 17. In this instance, a box I56 is provided having push button control I51 thereon which, when pressed downwardly actuates the recording and reproducing device in the forward direction, and which when elevated stops the device. The box may be connected through a suitable cable I58 to a plug I59 for insertion. in a receptacle in the device.

It will be appreciated that such remote control stations may be provided assimple accessory equipment to the magnetic recording and reproducing device. It will also be appreciated that, if so desired, the remote control station may be built into the base of an upstandin microphone placeable in an easily accessible position upon a dictators desk, so as to either pick up dictation or record a conversation occurring in the entire room.

The listen back arrangement In the event the magnetic. recording and reproducing device is employed for ofiice dictation work, it is desirable to provide the dictator with means of listening back. to a portion of a recording so that the dictator may readily pick up an interrupted train of thought. Means. for accomplishing this purpose are illustrated in Figures 18, 19 and 20. For purposes of clarity, the control push buttons are illustrated only diagrammatically in this showing.

With this arrangement, it is, desirable. to vary the character of the control panel 3 and the devices thereon above described in connection with Figure 1. The record and listen switch 52 is taken off the control panel, and a substitute mechanism is disposed inside the cabinet construction, a pair of pushbuttons being placed on the control panel to control that inside switching arrangement.

In this instance, a control panel IE0 is provided which includes the. same volume control 53 with its indicating lamp 54 as above described. Also in this panel is a series of. push button controls including a repeat button IIiI, a forward listen button I62, a rewind button I63, a forward record button I64, and av stop. button I65. Each of these buttons isv provided with a jewel type signal lamp I66 to denote which button is controlling the operation of the. device at any particular time.

The repeat button IIiI. is mounted on a shank IGI whichv terminates at its lower end in a piston I58 of dashpot arrangement I69, the piston having the customary valved opening I'll] therein. That is, there is a large opening permitting ready movement of the piston in a, downward direction, and the valve itself which. blocks. the. large opening on the upstroke has av minute opening therein to slow the upward movement. The piston is moved upwardly or forced back to its original position by means of a pring I1 I in the dashpot. The shank or plunger I61 carries a latching lever I12 pivoted directly to the shank or plunger as indicated at I13. This latching member has a latching end I14, and at the opposite end is provided with an arcuate edge contour as indicated at I15. The latch member is normally urged into the position seen in Figure 20 by means of a spring I'I6 connected both to the latch member and at the opposite end anchoredto the cabinet construction. A trip pin I 11 extends outwardly from the cabinet construction adjacent the plunger I61, in position to also control the'latch member on the upward stroke of the plunger. The plunger I51 also carries a rigid lug I18 projecting therefrom in position to engage the adjacent end of a horizontally disposed rigid bar I19 connected to the plunger I88 for the push button I83, the rewind button. The plunger I8I of the forward listen push button I62 has a horizontally disposed lever I82 pivoted thereto near one end of the lever as indicated at I83. This lever is pivoted intermediately at I84 to a pin carried by the cabinet construction.

Inside the cabinet construction a listen record switch arrangement I85 is located and controlled by a centrally pivoted lever I85. This lever is pivotally connected at one end to a vertically reciprocable actuating bar I81, and at the opposite end is pivoted to a vertically reciprocable actuating bar I88 having an enlarged head I89 on the upper end. Each of these bars I81 and I88 are limited to a vertical movement only by means of a suitable pin and slot connection as indicated at I90. The head I89 of the bar I88 may be engaged by either the plunger I89 or the plunger I8I, and the bar I81 is engageable by a plunger I9I carrying the forward record push button I64.

In operation, the listen back arrangement is extremely simple and requires only a minimum of movements on the part of the dictator. Assuming that the forward record push button I54 has been pressed inwardly, so that the listen record switch is thrown in the opposite direction from the showing in Figure 19, and the dictator desires to listen back, it is simply necessary for him to press the repeat button I8I. Upon the pressing of that button, the lug I18 on the plunger I31 by means of the arm I19 forces down the rewind button II53 so that its shank or plunger I89 actuates the listen record switch in the opposite direction by forcing down the bar I88. At the same time, the piston IE8 is forced downwardly in the dashpot I59 against the action of the spring HI, and the latching end I'M of the latch lever I12 engages behind the free end of the lever I82. Consequently, rewinding of the recording medium 22 occurs during the time it takes the spring I'II to force the dashpot piston I58 back to its original position. This is only a relatively short interval of time and necessitates little waiting on the part of the dictator. As the plunger IE1 is forced upwardly by the dashpot spring, the lever I82 is pivoted to move the plunger I8I and forward listen push button I52 inwardly and establish a closing of the forward listen circuit. As that circuit is established, the curvate edge portion I15 of the lever I12 strikes the trip pin I11 and is pivoted against the action of the spring I18 to free the lever from its latching engagement with the pivoted lever I82, thus releasing the interlocking of the parts, and restoring the parts to what may be termed neutral position.

It will be noted that during this operation, the various circuits of the recording and reproducing device have been shifted so that the device is energized for listening or reproduction, and the forward listen switch has been moved so as to energize the necessary circuit. Therefore, immediately upon restoration of the dashpot piston from the position seen in Figure 20 to the position seen in Figure 19, the rewound portion of the recording medium will be reproduced audi- 'bly through. the loud speaker ID for the benefit of the dictator. As soon as the dictator has listened back to the short portion of his previous dictation, he may then press the forward record button I64'to throw the listen record switch I in the opposite direction and proceed with his dictation.

In the event the dictator desires to make a correction or change some of his previous dictation, he may be pressing the rewind button cause a rewinding of a part of his previous dictation, and then by pressing the forward record button re-dictate the rewound portion. As the recording medium in this operation passes through the head 3I, the previous dictation will automatically be erased or cleansed from the wire, and the new correct dictation placed upon the wire. It will be seen that the rewind button I63 may be pressed downwardly to establish rewinding, without disturbing the repeat and forward listen buttons or their associated apparatus.

Thus, it will be seen that the simplified mechanical arrangement shown in Figures 18, 19 and 20 efiectively provides the dictator with substantially a universal control of the device with a minimum number of movements on the part of the dictator himself.

The circuit arrangement The various circuit connections for the recording and reproducing device are illustrated briefly and diagrammatically in Figure 21. For purposes of clarity the circuit arrangement has been boxed off by dot-dash lines into what might be termed sub-assembly circuits so that salient parts of the various circuits may be more easily identified in relation to their actuation of structure described in connection with Figures 1 to 20, inclusive. To this end, the oscillator and amplifier circuits have been included in a dot-dash boxing I92; the control panel circuits are boxed as indicated at I93; the main drive unit, unit I3, together with the magazine circuit connections are boxed as indicated at I94; the circuits for the other drive unit, unit I4, are boxed as indicated at I95; and the plug and jack arrangement is boxed a indicated at I96.

Also for purposes of clarity, various portions of the circuits have been shown bracketed and connected by a master multi-wire cable, which cable may or may not be used in actual practice but which is convenient for illustrative purposes. For example, a portion of the oscillator and amplifier circuit arrangement is connected through cable I91 to the magazine associated with the main drive unit and to certain controls in that drive unit. Another portion of the oscillator and amplifier circuit is connected through cable I98 to the plug and jack assembly. The main energizing conductors from the amplifier arrangement are connected by way of cable I99 to the rewind drive unit, or unit I 4. The connections from the control panel to the main drive unit and the relays and switches associated therewith are contained in cable 280.

Also, for the purposes of convenience and clarity, all wires or conductors theoretically contained within the cables I91, I98, I99 and 290 are indicated by letters of the alphabet both at the beginning and the end of the respective cables. In the instance of cables I98 and 288 the sequence of conductors at one end of the cable is not the same asthat at the other end.

The oscillator and amplifier arrangement has 17' been generally indicated by; numeral MI, and very diagrammatically illustrated, the circuits involved in an oscillator and amplifier arrangement of'this character'being well knownto those skilled in the art.

Starting with the plug and jack receptacle I95, when a plug 202 is connected with any suitable source of 11'5-vo1t alternating current, such current passes through conductors G and" H which are included in the cable I08, and enter the'os'cillatorand amplifier 20I. Obviously a line switch ma be included in this circuit and associated with the oscillator and amplifier or in' some other feasible location, if so? desired. The oscillator and amplifier arrangement is" such that when conductors'G and H are energized with a Il'S-v'olt alternating current there will be the'same voltage and alternating current exiting from the arrangement 20I across a pair of conductors Q and R. Likewise'by virtue of therec'tifica'tion' of current in the amplifier exiting conductors O' andP" will have a l10'-volt direct current thereacross; the conductor being the" negative conductor and the conductor P being the" positive. In addition; another pair of conductors 203 and 204" exiting from the arrangement 201 will have approximately -vo1t alternating current thereacross; these being the feed conductors to the pilot or signal lamps'5'l.

Again referring to the plugv and jack boxing I96 there is shown a microphone jack 205 to which a microphone or other pick-up device may be connectedforrecording purposes. This jack is connected through primary cable M to the oscillator and amplifier arrangement I. An output jack 206 is'a'lso provided to which an' additional loud speaker or earphones may be connected. Earphones may be used in connection with this jack by the transcriber of recorded dictation. This'jackis connected to the arrangement 20! through wires I,.J and K. A first stage jack 207 is alsoincluded in the plug'and jack assembly, and this jack is'connect'ed to the arrangement 2"0"I 'by'm'ea'nsi of aprimary cable L. It is desir able to use this'jack for the microphone or pick up" in the case where a record is made from aradio' loud speaker; or other sound source having, extra'volume so as to prevent overloading of the first tube of the amplifier circuit. In other words, thisjack' cuts out a portion of the amplification where'thesame is not neededby the pick-up element;

For-recording. purposes a microphone may be connected to the jack 205, the switch 52 thrown tothe record position, volume control 53 adjusted to give the correct amount of volume as indicated by the volume level indicator 5.4, and this volume control is preferably exercised"immedi'- a-tely at the start of the recording operation. after the motor 62' has been energized and the recording medium 22 is travelling fromiree120'to reel 2I.

In order to start the device in operation for recording purposes, it is a' simple expedient to press the forward button 48', holding'it' down momentarily until the respective relay, the aforesaid relay I03, has operated and closed the asso-'" ciated circuit through the gang switch I00; Tn Figure 21, relay I03 is shown in the energizedposition, that is, the core of "the relay has been drawn upwardly and the gang switch has closed all of the associated circuits for the upward movement of the relay armature. The-circuit causing energization of the motor may be'traced through as follo-ws: From the positive1l0-volt direct cur rent conductor P through a lead 200 containing a current limiting resistor 209, through a portion of conductor DD, contact points 210' of the switch 48, conductor 2"I'I to and through conductor Z passing through the cable 230', thence through conductor 2'I2', the coil of relay I03, con d'uctor 2I3; contact 2I'4 with the recording medium, through the recording, medium itself, the conductive bridge 2| 5 around the recording'head, contact 216' with the recording medium on reel 20', conductor Y also passing through the cable 200 to conductor 2H and back to conductor 0, the" negative side (if the llU-VOl't line. Vvith the gang switch I09" thusclosed, the motor circuit proper includes the following: Conductor F'-F from conductor R (one side of the1l'5-volt alternatinfg' currentcircuiti through the cable 200; to contact point 2T8 oi the gang switch, thence through a Wire 2T9 tO' tne'nrotor' 62, and the return circuit embodies the conductor" EE" with the? switch T39 therein and which also passes through the cable 200 back to conductor Q, the other'sideof the 1l5volt line;

As stated hereinabove; the magazine might incorporate" means for passing current directly through the recording medium so as to insure a stopping of the motor in the event the recording medium should break, and in the event the recording' medium is about to become totally 1mwound from either'of the reels 20'or2l. Each of the r'eels'is provided with a contact, and when all of the recording medium runs on" that particular contact, the circuit through the medium is broken. These contacts are designated 2'I'4' and 2'I6-for the reels 2'1" and 20, respectively, in Figure '21; The'current travels from either con"- tacts' 214 or 216' through the recording medium itself, and a shuntbridge 21'5' isprOVi'ded around the recording hea'd' 3|", the shunt bridge being connectedat an intermediate point to cable conductor A"A.

During'a recording'operation, the'erasing portion in the'head: 3I is energized from the oscillator circuit through conductors'A and B'passing through cable I9I. The recording part of the" head, asthe'case maybe; is energized from the also passing through cable I91 and" the aforesaid transformer I2 is embodied in this circuit; The preferable high frequency component through thec'oilof the recording and'repjroducing portion of the" head 3I 'may be obtained byway'of leakage-'from'the erasing part of that head, since the conductors A andB will be carrying high frequency current from the oscillator.

While the device-is recordingi o'r' reproducing, themotor having been" started as above explained in'theforwarddirection, the pilot lamp 5I' corresponding to 'the'forward button 48 will be illumihat-ed; This is accomplishedby way of a simple circuit including the aforesaid" 5-volt alternating? current conductors 203 and 204; the current travelling through conductor- 203; the pilot lamp 51; conductor V passing through cable 20!), contact 2 20 of the gang switch I09, and thence throughconductor X also passing through cable 200; back to'conductor 204. Each of the other push buttons, the stop'button 49 and the rewind button 50 are equipped with similar pilot lamps operating through similar circuits which .need not be specifically set forth herein, but which are clearly illustrated in Figure 21. It will be noted, however; thatthecircuit through conductor T of. thepilotlam'p for the stop switch 49 is broken at contact 22 I of the gang switch I09, and that con- 19 tact will not be closed until the relay I03 is de energized, so that the stop switch pilot lamp remains dark while operation proceeds from one of the other switches, and is illuminated when the recording medium is not moving at all.

The other contact 222 of the gang switch 109 establishes a connection between a wire 223 and the wire 2l2 leading to the coil of the relay 1 03 so that this coil remains energized and the relay remains in circuit closing position after the starting button 48 has been released. It will be recalled that the operation of relay [03 causes its armature to physically move the reverse rewind friction drive roll 96 out of contact with the motor shaft 63 and the idler friction roll 94 above discussed in connection with Figure 14.

If, during the recording operation or the reproduction operation as the case may be while the device is operating in the forward direction, the recording medium 22 becomes so far unwound from the reel 20 as to open the circuit at the contact 2 It, the above described circuit through the relay IE3 is opened and the relay releases thereby breaking the circuit through the motor 62 and stopping operation completely. Pressing the forward button 48 will not again start operation, because pressing that button cannot reclose the circuit where it was broken at contact 216. The only way the circuit can again be closed at contact 2H3 is by changing magazines, or operating the device in the reverse or'rewind direction so that the recording medium again accumulates on reel 29 and closes the circuit at contact 2l6. To effect this rewinding operation, the rewind button 58 is pressed momentarily to energize the relay H0, which relay and its associated gang switch H8 is illustrated in deenergized position in Figure 21. Current will then flow from the positive 110-volt conductor 208 through contact 224 of the rewind switch 50 to conductor BB which passes through the'cable 290, and then through the coil of relay H0, through conductor 2I3, contact 2l4 with the recording medium on reel 2|, through the recording medium, the bridge 2| 5, and thence through conductor A-A to contact 225 of the rewind switch to the negative 110- volt conductor 2H. The armature of the relay I I is thereby moved to closed position, reversing the gang switch H6 from the position seen in Figure 21 and. the motor 62 is energized by way of alternating current conductor EE, aforesaid conductor 219, contact 226 of the relay switch, a conductor 227, and conductor F-F which is the other side of the alternating current line. With reference once again to Figure 14 it will be recalled that the relay llll physically moves the forward drive friction wheel 64 out of contact with the motor shaft and the clutch H, and the relay 33 having been released has permitted the reverse friction drive wheel 96 to return to operating position so that the recording medium now moves in the rewind or reverse direction.

The release of the relay I83 by the breaking of the circuit at the contact 216, above mentioned, opened the circuit through the pilot lamp for the forward button. Energizing of .relay H0 closes the circuit through the pilot lamp of the rewind button by way of conductor 204, conductor W, contact 221 of the relay switch, and conductor F back to the opposite side of the low voltage line, conductor .203. Upon releasing the rewind button 50 the relay H0 remain energized by virtue of contact 228 connecting the relay coil to conductor DD by way. of wires 229 and230.

If the recording medium or wire 22 breaks or tends to become completely unwound from the reel 2|, the circuit 'will be broken at the contact 2l4 thus opening the circuit by way of conductor 2l3 through the coil of relay H0 and releasing this relay. Again pressing the rewind button will not start operation in the reverse direction, that is in the same direction of movement of the medium when the circuit was broken at contact 214. The only way the circuit can again be made at that contact, is by changing magazines or again pressing the forward button to start operation in the forward direction.

When the relay I I0 is energized for the rewind operation, contact 23! of the gang witch H6 being closed, shorts out the loud speaker l0, and at the same time contact 232 now being opened cuts off the oscillator circuit to de-energize the erase portion of the head 3| so that a recording will not be removed from the medium during the rewinding operation.

It will be noted from the above description that if the recording medium tends to run off either of the reels 2!] and 2|, the respective relay then in operation will be released to stop operation. As pointed out above, the other relay may be energized to resume operation in the opposite direction. However, if the recording medium breaks it is apparent that neither relay can be energized, because the circuit 'will be opened through the shunt bridge 245 and consequently conductor AA. Nothing can then be done to effect operation in either direction except by way of repair of the break in the recording medium.

During operation of the device in either direction, pressing the stop button 49 will short out either rela I03 or III] and. thus stop the drive system in the manner above explained. Assuming, for example, that relay I03 is energized, when the stop button is pressed closing of the circuit at contact 233 results in the -volt direct current energizing the coil of that relay taking the following path: From the positive line P through conductor 208 to conductor DD,

thence through the cable 200, and through contact 222 of the relay to conductor 223 and back through conductor Z to conductor 2| I, through.

the contact 233, conductor 234, to conductor 2|! and the negative side of the 110-volt line, conductor O. The relay coil is thereby shorted out, and the relay will obviously be released. To short out the coil of relay H0, the current by wayof the stop button takes the following path: Conductor 208 to conductor DD, through the cable 200, thence through DD, conductor 230, contact 228, conductor 229, to conductor BB, thence back through the cable 200 and from conductor BB to conductor 235, up through contact 236 of the stop button, and then through conductors 234 and 2H to the opposite side of the 1l0-volt line.

Pressing of the forward or rewind button, when operation is proceeding under the other button, will not effect any injury to the device or to the circuit. Assuming, for example, that the device isoperating in the rewind direction, having beenenergized by pressing the rewind button 50in the manner above explained, and assuming further that while this operation was proceeding the forward button 48 was pressed, contact point 23'! of the forward button would close a circuit shorting out the coil of relay H0 thus releasing that relay just before relay I 03 is energized. The current would take the following path: Through contact 238 of the rewind button will; short out.

the coil of the relay I63, and stop the forward movement, at the same time that relay; II]! is;

energized. In shorting out the coil of relay I93, the. current would take the following path:-

Through conductors 208, D.-D, 223, Z 2, a

conductor 239, the contact: 233 and rewind button, and through conductor ZI'I to the oppositev side of; the line.

Frorn the above descriptiorri-t will benoted that.

no injuryto the device or thecircuitwillresult in the eventboth the forward and; rewind buttons are pressed together. The coils of both relays will be shorted out in that event so. thatthe drive.

motor will not be energized.

The other drive unit, the unit generally." indicatedby numeral I4 and shown inFigure 21 with-..

in. the boxing I95, is provided preferably with its own push button. controls. These controls may; comprise, arewind; button. 240;. and a stop. button 24 I. Energy for. thisunitis. derived from. the aforesaid liq-volt, line conductors: O' and P, and the alternating current conductors Q and R throughthe cable I99.

When the; rewind button 240 is pressed, the

current will flow through conductor P and coil of. relay 242, conductor 243, contact 244.ofthe rewind button, conductor 245, contact 246 of'the stop button, conductor 241, and then'ce throughthe-recording medium 22. itself by way of contacts 2I4a. and. 2 I6a, tov conductor 0. The energizing ofthe. relay moves the core upwardly from the positionseenin Figure 21 so that relay contacts 248. and249 arein circuit closingposition. The closingof-circuit: through contact 248 shorts out contact 244. of. the rewind-button, permitting'the current. to passthrough aconductor 250" and thence. throughthe contact 248 to conductor 245,

thusmaintaining the relay energized after the- The closing of release of the rewind button 240. the. circuit through contact 249, energizes the motor- III by way of a conductor 25I and the alternating current conductors Q and R.

Thepressing of thestop button 24I breaks the current at contact 246, thus 'de-energizing therelay. 242, and opening the motor circuit at'contact 249.

It will berecalled thatthe switches I39 in thecircuit-of motor 62 and a-similarswitch- I39 in the circuit of motor II! of therespective drive unit cor-respond tothe micro-switch shown in Figures '7, 12-and 13 which is automatically operated by the-placingand removal of a magazine.- When a magazine isremoved, either switch I3'9is automatically opened thus breaking the circuit through the respective motor, and when a magazine is placed into position in the respective tray, that switch is automatically closed.

From the above specific descriptions of the respective circuits, and certain of the paths followed by the current during certain operations, other variationsiin the control of the device and the respective current paths will be' apparent without further specific descriptions herein.

In the lower portion ofthe boxing I93 of Fig. 21, Ihave indicated diagrammatically a receptacle 2521mm remote control station of ,thecharacter showninFig 15:. The contacts in the receptacle.

. 252 may be connected in parallel respectively with conductors S, T, U, V, W, X, Y, Z, A.A, Br-B,z C-C and- DD, and control of the device.- may be: had either by way of the remote controlstation on by way of the pushbuttons 48, 49 and. 5.9 on the; device itself. Likewisait will be understood that suitable remote control: receptacles may be had; to accommodate; remote control stations: of the; typesshownin Figures 16 and17; of. the drawings, if the same, are desired, and any number of: these. stations may be used in. parallel.

From the foregoing, it is apparent thatIi have provided a magnetic recording device which may function as. arecord reproducer, a record maker; or a dictating.- machine, and. wherein one recordingmay be wound for later reproductionwhile a: recording is being made, the machine embodying the use of simply removable and re'placeable magazines containing all of the recording medium proper, and the device being. entirely: controlled: by. push. buttons, equipped with automatic may features, and' with the circuit arrangements connected in substantiallyfool-proof fashion so that' nodamage occurs to either'the mechanism anthe- Y wiring circuits in: the event the operator makes a mistake in the operation. Furthermore, itis noted that a repeat arrangement is provided whereby a dictator canlisten backto a shortportion of a record at any time and immediatelypr'o 1 ceed with the following dictation. It shoulialso" be noted that thedevice employs a simple yet positivedriving system with a quick-actingbra-k ing system, and results in theautomatic' application of the brakes every time the machine is stopped, or results inthe stopping-of the respective motor in the application of brakes in the event a magazine is removed from the machine. Further, the machine is compact, takes up little space, may be mounted closeat-hand, or in some other suitable location and controlled remotely',.;.

socket formed in said cabinet, a magazine received, snugly in saidsocket and having a. reel shaft,. al. drive shaft extending into said socket for coupling with said reel shaft, latching means to hold said.

magazine in coupled position in said socket, ejector means reciprocable in and out of said socket for forcing said magazine outwardly from saidsocket to uncouple said shafts, manual releasemeans mechanically connected to said latching means. and said ejector means to contempora-.

neously unlatch and uncouple said magazine when. operated, andaspring operatively connectedwith said manual release means biasing the same. to hold said latching means in latching position and said ejector meansin retracted position.

2. In combination, a magnetic recording; as-

sembly including drive means, electrical circuit.v

arrangements controlling said drive meansand arranged for the making of a magnetic record-- ing, means associated. with said assembly,form.-.--

ing a socket for a magazine, a magazine contain? ing a recording medium removably mountablein said socket, means to hold said.v magazine-in. 

